-20=-5(+2z)

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Solution for -20=-5(+2z) equation: 



-20=-5(+2z)

We move all terms to the left:

-20-(-5(+2z))=0



We calculate terms in parentheses: -(-5(+2z)), so:

-5(+2z)

We multiply parentheses

-10z

Back to the equation:

-(-10z)



We get rid of parentheses

10z-20=0

We move all terms containing z to the left, all other terms to the right

10z=20

z=20/10

z=2

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